Sahil Takiar created HIVE-15546:
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Summary: Optimize Utilities.getInputPaths()
Key: HIVE-15546
URL: https://issues.apache.org/jira/browse/HIVE-15546
Project: Hive
Issue Type: Sub-task
Components: Hive
Reporter: Sahil Takiar
Assignee: Sahil Takiar
When running on blobstores (like S3) where metadata operations (like listStatus) are costly,
Utilities.getInputPaths() can add significant overhead when setting up the input paths for
an MR / Spark / Tez job.
The method performs a listStatus on all input paths in order to check if the path is empty.
If the path is empty, a dummy file is created for the given partition. This is all done sequentially.
This can be really slow when there are a lot of empty partitions. Even when all partitions
have input data, this can take a long time.
We should either:
(1) Just remove the logic to check if each input path is empty, and handle any edge cases
accordingly.
(2) Multi-thread the listStatus calls
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